Journal
POLYMER COMPOSITES
Volume 39, Issue 8, Pages 2634-2642Publisher
WILEY
DOI: 10.1002/pc.24253
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Funding
- Guizhou Province Science and Technology Fund [7096/2015]
- National Natural Science Foundation of China [51003088]
- Special Funds of Guizhou Province Outstanding Young Scientists [26/2015]
- Guizhou Province High-level Innovative Talents Training Project [4039/2015]
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In this work, the long glass fiber-reinforced polypropylene/red phosphorus (PP/LGF/RP) flame retardant composites were prepared by melting blend. The effects of thermo-oxidative aging on the mechanical properties, morphologies, and fire resistances of the PP/LGF/RP composites with different thermal exposure time at 140 degrees C were investigated and discussed. The results showed that the crystallinity of PP in the PP/LGF/RP composites decreased and the mechanical properties decreased significantly with increasing the aging time. The scanning electronic microscopy photos indicated that the obvious reticular crack appeared on the surface of PP/LGF/RP composites and larger cracks appeared in local scope with an increase of aging time. The results from energy dispersive X-ray analysis (EDAX) proved that RP migrated from the inner to the surface of the composites. And the corresponding temperatures of maximum weight loss rate (T-max) of the PP/LGF/RP composites remained nearly unchanged, but the initial decomposition temperature (T-5%) increased firstly, and then decreased. The flame retardant performances from the UL-94 tests, limiting oxygen index, and cone calorimeter test showed that the thermo-oxidative aging had a little effect on the flammability of the PP/LGF/RP composites. The thermal stability of PP/LGF/RP composites was improved slightly after thermo-oxidative aging. POLYM. COMPOS., 39:2634-2642, 2018. (c) 2016 Society of Plastics Engineers
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